Hydrogeochemical processes in clastic sedimentary rocks, South Korea: A natural analogue study of the role of dedolomitization in geologic carbon storage

Byoung Young Choi, Seong Taek Yun, Bernhard Mayer, So Young Hong, Kyoung Ho Kim, Ho Young Jo

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

For long-term mineral trapping of sequestered CO 2 in deep saline aquifers, base cations such as Ca 2+ and Mg 2+ are essential. As a natural analogue study of geologic carbon storage in deep aquifers hosted in sedimentary formations, we examined the hydrochemistry of sulfate-rich (up to 1140mg/l SO 4 2-) and moderately high P CO2 (10 -1.1 to 10 -2.4atm) groundwater in a Cretaceous non-marine sedimentary basin in South Korea with the objective to elucidate water-rock interactions controlling the concentrations and behavior of base cations. Principal component analysis of the acquired hydrochemical data indicated that dissolution of carbonates (calcite and dolomite) and evaporite minerals (halite and gypsum) controls the chemical composition of groundwater, resulting in substantial increases of the concentration s of Ca 2+, Mg 2+, Na +, Cl -, SO 4 2- and total dissolved solids (TDS) in deep groundwater. Na + versus Cl - and Ca 2++Mg 2+ versus HCO 3 -+SO 4 2- plots provided evidence for dissolution of halite and gypsum. Progressively increasing δ 34S values of dissolved SO 4 2- (from 15.1 to 19.2‰) with increasing sulfate concentrations indicated gypsum dissolution. Ion-ion plots (esp., Mg 2+/Ca 2+, Ca 2+/SO 4 2- and Mg 2+/SO 4 2-) and saturation indices of calcite, dolomite and gypsum suggest that the groundwater chemistry (esp., the concentrations of Ca 2+ and Mg 2+) is controlled by dedolomitization driven by gypsum dissolution. Groundwater in the study area does not reach complete equilibrium with respect to calcite and dolomite because of gypsum dissolution, which controls the Mg 2+/Ca 2+ ratios of groundwater. Continued calcite precipitation triggered by an excess Ca supply from gypsum dissolution reduces the concentrations of dissolved inorganic carbon (DIC) in groundwater. The increase of δ 13C DIC values from -11.1 to -6.5‰ concomitantly with increasing sulfate concentration was explained via geochemical modeling by dedolomitization under the rate constant ratio of about 0.038 between dolomite and calcite. The model results agree well with the observed Mg 2+/Ca 2+ ratios and further suggest a potential increase of the void volume in the aquifer through dedolomitization by about 0.72cm 3/l. Based on this analogue, we suggest that dedolomitization in concert with dissolution of gypsum may constitute an important process releasing base cations for mineral trapping of injected CO 2 in non-marine clastic sedimentary strata containing carbonates and gypsum in South Korea and elsewhere.

Original languageEnglish
Pages (from-to)103-113
Number of pages11
JournalChemical Geology
Volume306-307
DOIs
Publication statusPublished - 2012 May 4

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natural analog
Calcium Sulfate
Sedimentary rocks
clastic rock
Gypsum
carbon sequestration
gypsum
sedimentary rock
Carbon
Groundwater
Calcium Carbonate
Dissolution
Calcite
dissolution
groundwater
calcite
dolomite
Aquifers
Sulfates
Minerals

Keywords

  • Dedolomitization
  • Geologic carbon storage
  • Gypsum and carbonates
  • Hydrochemistry
  • Natural analogue
  • Stable isotopes

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology
  • Energy(all)

Cite this

Hydrogeochemical processes in clastic sedimentary rocks, South Korea : A natural analogue study of the role of dedolomitization in geologic carbon storage. / Choi, Byoung Young; Yun, Seong Taek; Mayer, Bernhard; Hong, So Young; Kim, Kyoung Ho; Jo, Ho Young.

In: Chemical Geology, Vol. 306-307, 04.05.2012, p. 103-113.

Research output: Contribution to journalArticle

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AU - Mayer, Bernhard

AU - Hong, So Young

AU - Kim, Kyoung Ho

AU - Jo, Ho Young

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KW - Geologic carbon storage

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KW - Hydrochemistry

KW - Natural analogue

KW - Stable isotopes

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